Spotted a small bug (also in 3.7 if I remember correctly).

- when editing a wall color/texture, setting are not applied after clicking "OK" in "modify walls" dialog

repro:
1) set any side of the wall to any texture and close "modify walls" dialog
2) open "modify walls" dialog again, and change wall side to "color" (but without clicking the color picker button)
3) hit "OK"
4) the wall side is still textured

Cheers,